I'm in the process of restoring an ancient Triplet Multimeter (model 60). I need a 300V AC source for calibration (60 Hz).
Any ideas for the most economical way to get there?
I was thinking about the voltage multiplier that Dave explained in the Uni-T UT513 Insulation tester teardown (episode #468) but I have no idea what diodes and capacitors to use in the circuit or if special precautions are needed as far as voltage isolation cut-outs on the circuit board.
A 120:300V transformer is about $50 and I was hoping to do it cheaper.
The only ac source I have besides direct mains is a signal generator that only does 10V peak to peak.
Thanks,
DrJoe